<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta http-equiv="Content-Language" content="en" />
    <title>s6-linux-init: the s6-halt program</title>
    <meta name="Description" content="s6-linux-init: the s6-halt program" />
    <meta name="Keywords" content="s6 linux init administration root utilities shutdown halt poweroff reboot" />
    <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> -->
  </head>
<body>

<p>
<a href="index.html">s6-linux-init</a><br />
<a href="http://skarnet.org/software/">Software</a><br />
<a href="http://skarnet.org/">skarnet.org</a>
</p>

<h1> The <tt>s6-halt</tt> program </h1>

<p>
<tt>s6-halt</tt> sends a signal to process 1 in order to halt the machine;
or, with the <tt>-f</tt> option, it performs an immediate hard shutdown.
</p>

<h2> Interface </h2>

<pre>
     s6-halt [ -h | -p | -r ] [ -f ]
</pre>

<ul>
 <li> s6-halt sends a signal to process 1. </li>
 <li> It then exits 0. </li>
</ul>

<h2> Options </h2>

<ul>
 <li> <tt>-h</tt>&nbsp;: halt. The command will order a halt (i.e. the system will
be shut down, but the power will remain up), which means
sending a SIGUSR2 to process 1. This is the default. </li>
 <li> <tt>-p</tt>&nbsp;: poweroff. The command will order a power off, which means
sending a SIGUSR1 to process 1. </li>
 <li> <tt>-r</tt>&nbsp;: reboot. The command will order a reboot, which means
sending a SIGINT to process 1. </li>
 <li> <tt>-f</tt>&nbsp;: force. The command will not send any signal to process 1;
it will just sync the filesystems then tell the kernel to halt, poweroff or reboot.
<tt>s6-reboot -f</tt> or <tt>s6-poweroff -f</tt> should be the last program
executed in the lifetime of a machine, at the end of the shutdown script called
by process 1 when it receives a signal telling it to shut down. </li>
</ul>

</body>
</html>
